Differences between 802.11a, 802.11b, 802.11g and 802.11n
SUBJECT:
Differences between 802.11a, 802.11b, 802.11g and 802.11n
SYMPTOM:
Wi-Fi
FIX:
  • 802.11a:
    • Operates in the 5.15GHz to 5.35GHz radio spectrum.
    • Speed: Up to 54Mbps (actual throughput is closer to 22Mbps)
    • Range: 50 feet
    • Less prone to interference.
    • More expensive.
    • Because 802.11b and 802.11a use different radio technologies and portions of the spectrum, they are incompatible with one another.
  • 802.11b:
    • Operates in the 2.4GHz radio spectrum.
    • Speed: Up to 11Mbps
    • Range: 100 feet
    • Prone to interference (it shares airspace with cell phones, Bluetooth, security radios, and other devices).
    • Least expensive wireless LAN specification.
    • The Wireless Ethernet Compatibility Alliance (WECA) has done its part by certifying hundreds of products to make sure they work together.
  • 802.11g:
    • Operates in the 2.4GHz radio spectrum.
    • Speed: Up to 54Mbps
    • Range: 100 feet
    • Prone to interference (it shares airspace with cell phones, Bluetooth, security radios, and other devices).
  • 802.11n (Draft):
    • Operates in the 2.4 or 5GHz radio spectrum
    • Speed: Up to 700Mbs
    • Range: 50 feet
    • Because 802.11b and 802.11g use the same radio technologies and portions of the spectrum, they are compatible with one another. But because the 802.11n standard has yet to be ratified by WECA, it may not be completely compatible with 802.11b and 802.11g.

NOTE:
More information can be found at http://www.wireless.att.com/wifi


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